Creating a twisting cable with multiple parts
Curves are certainly versatile, but for some cables you might try other techniques. An alternative involves rotating an array of cylinders around and empty...



...and adding a simple deform



Update: If you modeled the smallest cables and then joined Ctrl Jthem to the outer tubing, you could array them together. You could color the small cables first, but you probably have to 'Apply Array' to color the few outer cables. Most of the other thicker tubing seems easy to model, the only except being the blue ribbon for which curves might be appropriate.